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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26cba97759080aa41ece43663e525b9db263ea918ff301117e7be064ca41724' 
  AND token = 'ROwEMrUQCO1hCPSk4/Vjk6Sr5fDuIj8/S36m3A5HGlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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