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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b42bbabaeb02e18006d21b3be330c5826f1a04240a643ebeee9db001e305658' 
  AND token = 'SYvSxSttCLYL/apgmExksaIdIILoFHSkOcs0OHx2Onk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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