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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '557249ac7f7b8d5c569b2784f6624d9e9df23f6cb9780d65e4f0dbc6f430a567' 
  AND token = 'b4A4rchMAWjswSZDNkNTL0jpnvG7U66cTTxMTvSyKVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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