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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5813c502cb2de03e1db4a831c663bd0fd30726e4114d743ae6effaaa39acce2' 
  AND token = 'Vt23ChF5lMCxwUp0JkrhlaVw1OnSfj1cn/rpHLCTJfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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