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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3e3d919bf5bb4169e7714a8fa3b17c4c3df8c0e2e5f3722bf3a5e785f5d07a4' 
  AND token = 'DlCzvTEN0fAagxiEJE4NbJJfvrlVTMo129MCIBqiXjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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