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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6204d0b2fa3c6a49f8afcb7970899082c8d323083ebd23c90726f9b95a365685' 
  AND token = 'M8jLhshe2zf8+LRXIjtbk6y0Jc5cMNaro3DHYJJZviE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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