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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a7974c36e6088e40c88d6e616e7da4c5f1d5769319f9ce7a1c3d7fa4b24497' 
  AND token = 'ByoN5VA9UvdWe8ilxxpeKl6ZdSL4HuRgDjEubu2Ma6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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