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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71dc7df7f3acac5e6e16fa9374f1f133e37cef3e04927c0eb4c05b2748242afe' 
  AND token = 'a1DMW6k/80kjQFlYEfopRbkoQ/rdha0eJIdC2nZNEpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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