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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5bc6c0d5ff6ad367e560f3befb42aedf549ee95b080e46f6a302e7b1398ef6' 
  AND token = 'kZ2zOwd+bGDOC+bUb3DxxDPGt7fZhfm/+zUVS7R8Rco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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