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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6569369f5106fa61716059959ac851bb436fcc162b7c6db71285803e1c2dc2b' 
  AND token = 'XyOuE1xw/m2LEO1H8kdia+j8CeLaqDtH/g+AAReMEAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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