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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0138c2eb93666b5752a93a67d723bf420fdbd3bac12d5d3aa60af5e64b3ad9' 
  AND token = 'MIdVc3gP+PbhbbbU7T9zFs1EjinD+Ljsrq5cKewFob4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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