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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c202c0a6dc169ad222ced235f6963297acd2a679e30604d6b981cc6b4349f327' 
  AND token = 'JTwqjcsveRcTxUW2swntFVs9hDi/7iD4tl7PuhzLG0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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