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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a86efdf060e2f56c2958429b156d7be22d406801263dbf228a85e841709b3b' 
  AND token = 'KxMfDSExBOOs44QlsWvu3zp9tn9/JHCQigrO6DEkF5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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