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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bed3931fbe377d1cd762b26754539e498aa6077d95b3e02a73c1f74d8a39a6c' 
  AND token = 'p4ugkjoWy5y8z08UZo9vgc3FROg5h6b0OK42XcPyQKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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