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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '586204cc08f31d2c5bd277a961d3e8cc5e85be108d8b841bd61820112615456d' 
  AND token = 'N5rAxBNHtst4eVXKiAn1TdVEns5VESkJQEIVkwr+cG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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