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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8e571f2d51f3c13dc1a681e083adf673ca8e9558072d6c7a96a594e21f5b406' 
  AND token = 'CM5Fdiuv5Xqqzzl3FSAOguqv77menXPLY6WHexMRM5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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