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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fff67bc21952c0e728efb67c4a198f91cb3894ceb3607ad29b76e0f141b215de' 
  AND token = '4rWTrobeSfP4UP8FRGswjcR5ajSX3MSEujmgVLY5h7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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