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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd099573145b56efe6e1026602c4dde5c7c1989ba3c7368dce385c88763f75d' 
  AND token = '8lbY7CGqDPeKOKhM7D3O3stQsvjXSAEFF6lLMLeE8h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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