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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd9c4aeb68da23f841e4c4cdfedd2484ba7bb24eb072a8e2d5d0d237064a641' 
  AND token = '0axM/fJuw29gmIJslNmAhmkeq4/5Y35y6lVyLQUtygU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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