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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e723355cb76f4581849c08f405a422fa6477db9b296c0a752bcccc9b3c1b13fb' 
  AND token = 'lrE1UHFrFL8ipMLrMdBmXefOItKPZxUGFPQVTiWk+MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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