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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12335d27811bda3242c1ae38e3b6397fa3fbf27c2af48481bb4f85b83a52958e' 
  AND token = 'qwkPMz7l9xLHCOFkSmzilT6hRakeVy/XjdiHfRNh7MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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