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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631d042b014f85ba5b34f1e4f5059d21fbb1f4364aecbc8ab72bd6c408a3bd9f' 
  AND token = 'GIA4AJtyUGm5QE1pWXi/o7jrb36zzGUjBgaXHejDBuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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