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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37818edd5b9cfb6f89a452ef139eaee6fea7ec3da62f7637446d5787cf4fc886' 
  AND token = 'MVaz6q2xDYqPpM6Fzi/OSyCXs1TSBusaa42iL6ObTyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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