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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f3bce1e503288df1f544395dedd8ee80eb49c154e58ae4b0de470839397901' 
  AND token = 'IfrI0SnXxvysRAqN5FEibM9sHCYQgdbT0eR9VApEZ2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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