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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d56fd99b75553eea60cf936de03eb6f8ab12585faca3638bfba92487bd2254' 
  AND token = 'lB2yVLb5aiqg29JWJ7L96BLqr+MT7x2JCJWLUAkRfRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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