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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06c58bf3d087cc6617d19eea2e49326e4f7087f650b1e8d6ec0611fb0e9699f' 
  AND token = 'y8CpTBWVrtCCA4zS5a6pf2EKMwlNZ6oe26wntBG3ppU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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