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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ccc4bf54a3c0552d996e7cc6cef66a45e03c773921a311aff2110b72a90274' 
  AND token = 'zWOkMk/Ib/mBIb97SWCos2E2nBSc8Sry3AHcV9BEuN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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