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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc07f9d629d35b5a75f3f15c08c5e662eea63148217763975a00815beded783' 
  AND token = '9YboXNerDg3yphbkyaW39SUBt0BNqk40BSNDgrVJofM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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