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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '517a256ea751c62a8e108303b71bc78ed4299be0152a0c52ce514f256eaa3129' 
  AND token = 'lbs7aNruIDX79CD75DOCLY41YGcViUAHmf1qBPNpL88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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