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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd47fef1edfb7d00e834679d59e6ca01fd99f77f04861908ac720f3bb29bd2384' 
  AND token = 'b+SoMY/D6vWmgq7spV1AtSSkdvo/mXy9FAeS4LX5eF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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