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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c35da443e5504792c5f064bd9119c803af3d3f669320b17a2644bd64f3a2db10' 
  AND token = 'Jeq9O8zm78I2LbVxYeG3UoR+LOkEq17X/NNsZn6Wz48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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