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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '112a42f62bc3c1e75662f12d3c32f6b0405f176ba56be293209a03250f1ac2de' 
  AND token = 'f3kCNYLN/vFjCskmVWQww28Eltf4ALMpiYJEBntfHUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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