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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2c49c04c80d069cdcc53b1f704cc89e9bc3e63451bc29d704bc56d5d1485724' 
  AND token = 'Y/wajw46nV9OUmsbGzH2q7e+ii64hHWR3IETu2lzlOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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