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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '004076eb3bce97399389bd5133ec230c95de66970348c78ffc3f2a72e5e92269' 
  AND token = 'yz5l9PgTI1Eao8WSdVYkWTEdddP3ud6nEaOYm69kSvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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