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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d1c38b421802819877a6e647d1f1c21e62ce6861e75735ab9f83177f08cbc9' 
  AND token = 'RDFKt6pb0Q7F3GaPDmebaTR7DXR3blZeA0XhZyltTrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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