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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '155a5a91caef1c78930d211c8df988976b6a6983bbd7134a3fcfeae7527dae44' 
  AND token = 'D+LFtDRtPTSlYQqE4EaW33ZSrWMKeeS6dNyJUz6mb5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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