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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a530b96716142b12e95b85e8f91076d126f9a2f486b1c975cef9e9fcc6d81a8' 
  AND token = 'KRc9SIvTCBtfKeGz46HqNbziPl6ga8/nk2PTqYrLtgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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