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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a9b640ce68e46d90c7cc202535abbd6628fd1ce218b7901a5347f49bd37689' 
  AND token = 'bRefHkMVNSfsFP0155DL+77BENLYWIZRn3M/ld7tpow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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