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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '582c24ae6cc5ddfcb559f8ae29a89a62cb2fd045229e6eb8581bd71b11e7c9b5' 
  AND token = 'ss++jE1HxvigBdab9ICi8g0IRf36f9aUFN/ah+JvKZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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