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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e78d667d9a83676939c634bc43c8ceee824eee55c6a0dba0007393b445a73ffd' 
  AND token = 'zoGDqHHWCrEkL4qnh0ydneMxdbx/hCsT8FXCIRfV0+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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