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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef0ea615f7e74799ee476fa043dd4dd85b78f140acd4bd13625ee6c2412eec85' 
  AND token = 'Rl3gejGdKheqhYS0OENqrPKar2OkFfdv9GKqCWw7bMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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