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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4da2fe46b3239877d88d571f4e710075a288fb7c3a31bec4b6c0dfb53bbb7a9' 
  AND token = 'YFr1fqx/3aRB17Sl02kU6zimFZ8OBKC5OAP6OKiGxEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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