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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9d50210da3227743ad2e8f9691f579b73e03711c80ea61451149a17f13dcca' 
  AND token = 'Rs1r6jAoKbLbzXCZl6deULuKoOe2QqJch3rKgIcU+ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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