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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0e4a9b8bc537dd0637cfc1ca0170d0a70fb52dd2c1914c6059ad96c4c517033' 
  AND token = 'zWsELPfqNYNpqtIz5VFx57sKtTJ3wsi1hy0J/Tj2nus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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