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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93df005e51a949292b3dc60df1eafea977f9459b0e03afb212a99fb081a38c7' 
  AND token = 'hGT8v2M3mY46GRT5YBBCLewHPkh7qM2km6ppeShV4DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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