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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e5bee20784cbb95c01d2407326ebfd9b5aa8b88bb6d4672ef44211537a1230b' 
  AND token = '9FR3fBpAz0s5CW07HRfhNezlYPJv1CJGyjFd2xMBDSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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