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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d63371d4096a398c67a7af0e169b38586481690779486d5a68aebeb3793c29' 
  AND token = 'Abih5T0uhbXL54ZaJN9WnWLqTT0kjP/1Lp/sr39JVyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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