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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9903c507496a9a68332367b11fb07fb8635cc460aebd0dbcc62dcdec4522cd6' 
  AND token = 'nw/wFM1T9utj4RNzbkuxuij6Ucu5Wdze7Ng71zGb7nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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