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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14942ff31028e5006c4879d942f38969ade39de5c042d61dec297123653eea94' 
  AND token = 'EW2JOb0XnEqgJ37/4xT9U0qrkkllMaCMSejfXCTYgzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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