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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea10a1cf974431478ce6bf86649331b9df2c740c6c6b47a2d9d0f5026a2fa8a0' 
  AND token = 'lKwMkPFZry9cf5uMp8ZaI0Lvp6TKAlcJfIxcpT295pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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