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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ff9960195c11a11d53dcd197fd63b33e9f93e710d3bfb495de96f2a1d494186' 
  AND token = 'nVvHO4W90tl5Znp5EHGK3RPC9nUeCrrErcFekbcKT14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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