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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce215049ea3a7c76aa18a2a3f13f0a88ce9f7af0b30f6ecb6cf9b17fa928bd2' 
  AND token = '/SNWYtV0qfN58w65DezmETS3Jb+p7xH6RF/Qew6qNRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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