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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c338bfbe194b68bcb720e136d9f26f24ecc6d905d5a4d008c3306d5858583738' 
  AND token = 'NYgu1yHlj0+d4aL4aRmscA8RMW1Lv6cWyx66NfbwVS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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