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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eccc2d64adde0de6d508b6b53b66ac1d615027d28105c2c3eeb986d90925850' 
  AND token = 'Hnp298KMFU5PFtuiUrmEe6TqbP8w1Rn0DFB0Q+gq9hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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