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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d996b8a152b022cc645ab02d7c8d00b15851b057ac306333d482b5712f3e8a3' 
  AND token = 'RT+3Br8HYQky0SlSrhrg26w1UNqsttnqFP8hoNeFXT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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