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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3690a23d7c23ebcd8ef6b3410f3b54969cfafcbbc3fc1e08eff993b0d4c4e4' 
  AND token = 'HQxIwX6roB8ugC08iq+G3dPWRi+R6ZiKbaiezLb8SSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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