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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bef2b0575782b11859fbebe0dc6690032b8416f2881cc114318e7e132d882dd7' 
  AND token = 'p7tS0URj+C8z01g6tcvSIkwm+3Z2Hdwu024O4iNFA8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}