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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70147c20e29fc99a7c2d71875b4389d8c402c7c4cab89348ad5961450f86329' 
  AND token = 'LfFI1DKDElWIj/kZAwV5IpfIy40/hzaLBeveM5KLe2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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