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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17db0f2aa26f744e8761789356da88afbe34f2f6352b762e96d21bcf90d5a0a0' 
  AND token = 'RlnoUn7zqx7cHRtTqO8kIACPb9OqfyqYVZlF0eA5yYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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