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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d6c84b90fe06737d41242beee8883ee90e50564a74a9690bb949dd50321476e' 
  AND token = 'yZE0oW5pI/zijeb1f2bqB8BfWpztVa8dqJbuO0vFqeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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