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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d30dfda3dcaf03c614a3888b97707c4c66d4d60571cece181e1bb1c77fb3e4d' 
  AND token = 'JSW9tGhWioIcEzYTg6ahPW28KgAGd6PI7SFW5vU/++Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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