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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40712b26b750fa0704bb370ca4642029f2a53501526cefbfdd5d928b2cee0ac' 
  AND token = 'rDItst6V0Jl3f1dUCt59rh3PZfWJPfCg6lkGwJzcjk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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