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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d3bf77f8c9db5b280667f39340e8279d4bffb21bfa936e703bbf48900138b9a' 
  AND token = 'uXSGeEy4hZUmycM5zKl2+IF0+1qs/19NkpTZ3UsZr/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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