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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae11f8f3cce1374080c460f9ed89f1360759ee7c1c9179a650c8cc5e5ff79b6a' 
  AND token = '7vNZ+XNNC7+7zhuGU3hAFn3M/Ci/Z/WkXgtAkFhGicg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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