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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26329897a9d31a7267cafb2de1adf72ed4830c3ffeb56620159f33169a58b762' 
  AND token = 'AiRop2iJ5zudQw0kM20mCru3clC/v5r2KrtyyCwifpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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